Search problems with LDAP SDK 4 Java

Hello,
I try to retrieve some entries from my openldap 2.1.4 server using
the "netscape directory sdk 4 java"
If I try to get some entries from the server I get "random" results.
the Resultset.getCount() says 2, if it should be 4
says 1 if it should be 2
debug-output from slapd is curious (to me).
saying very often: "error 11: resource temporary unavailable"
does these two things have sth to do with each other?
regards
Ingo Schaefer